Description

In the Linux kernel, the following vulnerability has been resolved:

s390/ism: add release function for struct device

According to device_release() in /drivers/base/core.c,
a device without a release function is a broken device
and must be fixed.

The current code directly frees the device after calling device_add()
without waiting for other kernel parts to release their references.
Thus, a reference could still be held to a struct device,
e.g., by sysfs, leading to potential use-after-free
issues if a proper release function is not set.

Classification

CVE ID: CVE-2025-21856

Affected Products

Vendor: Linux, Linux

Product: Linux, Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 1.83% (scored less or equal to compared to others)

EPSS Date: 2025-04-10 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-21856
https://git.kernel.org/stable/c/940d15254d2216b585558bcf36312da50074e711
https://git.kernel.org/stable/c/0505ff2936f166405d81d0d454a81d9c14124344
https://git.kernel.org/stable/c/e26e8ac27351f457091459a0a355bacd06d5bb2b
https://git.kernel.org/stable/c/915e34d5ad35a6a9e56113f852ade4a730fb88f0

Timeline